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cos 36^@ - cos72^@ =...

`cos 36^@ - cos72^@` =

A

1

B

`1/2`

C

`1/4`

D

`1/8`

Text Solution

Verified by Experts

The correct Answer is:
B
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Value of cos 18^@ - sin 72^@

A= cos 20^(@) cos 40^(@) cos 60^@ cos 80^(@) , B= cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@) and C= cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@) then

Knowledge Check

  • cos 36^(@) - cos 72^(@) =

    A
    `1 `
    B
    `(1)/(2)`
    C
    `(1)/(4)`
    D
    `(1)/(8)`

  • cos 6^(@) * cos 42^(@) * cos 60^(@) * cos 66^@ * cos 78^@=

    A
    `1//16`
    B
    `3//16`
    C
    `1//32`
    D
    `1//8`

  • I : cos 52^(@) + cos 68^(@) + cos 172^(@)=1//2 II : 4 sin A cos^(3) A - 4 cos A sin^(3) A = cos 4A

    A
    only I is true
    B
    only II is true
    C
    both I & II are true
    D
    neither I nor II are true

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    Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0

    Show that : cos 36^(@) cos 54^(@) - sin 36^(@) sin 54^(@) = 0 .

    cos6^(@) cos42^(@) cos66^(@) cos78^(@) =

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